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Which chordate subphylum includes animals with backbones?
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Chordate
X-ray fish (Pristella maxillaris), is an example of a chordate with a visible backbone.
The subphylum of the phylum Chordata that includes animals with backbones is Vertebrata (the vertebrates).12
These animals derive their name from the backbone, which serves as a defining characteristic and partly encloses their central nervous system. In addition to the vertebrates, the phylum Chordata includes two other subphyla: Tunicata (tunicates) and Cephalochordata (lancelets).123